flatcar-scripts/clean_loopback_devices
Brian Harring ece65e0633 Add a umount wrapper to suppress gvfsd/trashd breaking umount calls.
Specifically, detect if the umount failed due to current access, if so,
give it up to 9 more runs (w/ 1s pauses) continuing only if it's still
failing due to currently open files.

Via this, it should suppress the race of gvfs/trashd looking at
quick mounted/umounted pathways.

This CL is a two parter; this adds the script, and converts common.sh
consumers over to using the override.

The next CL will modify the chroot itself to ensure our script gets
picked up/used.

BUG=chromium-os:23443
TEST=trybot, manul validation.

Change-Id: I92dedd91d6133c2063b1e5dbbc1a68366844801d
Reviewed-on: https://gerrit.chromium.org/gerrit/32087
Commit-Ready: Brian Harring <ferringb@chromium.org>
Reviewed-by: Brian Harring <ferringb@chromium.org>
Tested-by: Brian Harring <ferringb@chromium.org>
2012-09-05 00:00:43 -07:00

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#!/bin/sh
# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Force cleans loopback devices from within your chroot environment. This
# script is to help mitigate losing loopback devices on build_images
# failures. This script only affects mountpoints and loopback devices
# that were created within this chroot.
SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
. "${SCRIPT_ROOT}/common.sh" || exit 1
# Script must be run inside the chroot.
assert_inside_chroot
DEFINE_string output_root "$DEFAULT_BUILD_ROOT/images" \
"Directory in which to place image result directories (named by version)"
DEFINE_string board "$DEFAULT_BOARD" \
"The board to build an image for."
# Parse command line.
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"
if [[ -z "${FLAGS_board}" ]]; then
error "--board is required."
exit 1
fi
OUTPUT_DIR="${FLAGS_output_root}/${FLAGS_board}"
echo 'This will unmount all directories matching /tmp/esp.*'
echo "and any directory under $OUTPUT_DIR"
read -p "Are you sure (y/N)? " SURE
SURE="${SURE:0:1}" # Get just the first character
if [ "${SURE}" != "y" ]; then
echo "Ok, better safe than sorry."
exit 1
fi
safe_umount "$OUTPUT_DIR"/*/* 2> /dev/null
safe_umount /tmp/esp.* 2> /dev/null
sudo losetup -d /dev/loop* 2> /dev/null